Rotary hook for thread-knotting machines

ABSTRACT

An improved hook for thread-knotting machines is disclosed, which comprises a stalk with which the hooked portion is integral, a sunk portion in the hook stalk to lodge, in the order given, a spreader washer, an oscillatory blade whose rear extensions act as cam followers, a stationary blade and a supporting plate. Fastening means (screws) are provided to assembly the above enumerated component parts. A hook so constructed is cheaper, sturdier and more reliable in operation than the hitherto conventional hooks for knot-making machines.

United States Patent [1 1 Messa 1 ROTARY HOOK FOR THREAD-KNOTTING MACHINES [76] Inventor: Pietro Messa, via Manzoni, 13-Salo (Brescia), Italy [22] Filed: June 13, 1974 [21] Appl. No.: 479,266

[30] Foreign Application Priority Data June 15, 1973 Italy 21671 B/73[U] [52] US. Cl. 289/5 [51] Int. Cl B65h 69/04 [58] Field of Search 112/156, 22; 289/2, 3, 289/5, 8, 11; 24/2305 R, 230.5 P, 230.5 A

[56] References Cited UNITED STATES PATENTS 949,408 2/1910 Anderson 289/5 3,017,211 l/l962 Trost 289/3 June 17, 1975 FOREIGN PATENTS OR APPLICATIONS 547,480 8/1956 Italy 289/5 307,290 5/1955 Switzerland 289/2 Primary ExaminerDonald A. Griffin 5 7 1 ABSTRACT An improved hook for thread-knotting machines is disclosed, which comprises a stalk with which the hooked portion is integral, a sunk portion in the hook stalk to lodge, in the order given, a spreader washer, an oscillatory blade whose rear extensions act as cam followers, a stationary blade and a supporting plate. Fastening means (screws) are provided to assembly the above enumerated component parts. A hook so constructed is cheaper, sturdier and more reliable in operation than the hitherto conventional hooks for knot-making machines.

5 Claims, 4 Drawing Figures ROTARY HOOK FOR THREAD-KNOTTING MACHINES This invention relates to a rotary hook for those knotmaking machines which are used in the textile industry for jointing threads.

A knot-making machine of this kind, for example, is disclosed and illustrated in detail in the ltalian Pat. No. 733.009.

Hooks for conventional knot-making machines have a stationary blade mounted on an abutment or shoulder formed as an entity with the stalk: this is made in order properly to space apart the stationary blade from the hook, so as to provide, therebetween, a seat for the oscillatory blade. The stationary blade is screwed to the stalk and is maintained in position with the aid of an external supporting plate. The oscillatory blade, in addition, has two rear extensions on which, during the rotation of the hook, the cam is active, which controls the oscillation of the same blade.

Hooks so constructed have originated several defects.

In the first place, the machining of the shoulder on the stalk is comparatively cumbersome and consequently expensive.

Another drawback as shown by the conventional hooks is due to the side supporting plate which, due to reasons of configuration and installation, does not ensure to the hooks an adequate sturdiness and reliability of operation. Due to the multiply threads wound about the blades and/or the rear extensions of the oscillatory blade, breakages of these component parts can occur, as they are comparatively weak.

An object of the present invention is to provide a hook having such a structure as to do away with the above enumerated defects.

To this purpose, according to the invention, it has been envisaged to provide a hook for knot-making machines for threads of the kind referred to above in which the projection or shoulder on the stalk has been replaced by a spreader washer.

Another feature of the hook according to the invention is the configuration of the supporting plate and its mode of mounting on the hook stalk. The plate suggested herein, in fact, contrary to the conventional ones, has a width which is appreciably larger than the stalk diameter and, in addition, is terminated, in its rear portion, by a fork which straddles the diametrically opposite planar surfaces as formed on the stalk.

In addition, according to the invention, the rear extensions of the oscillatory blade are smoothly radiussed with respect thereto.

The hook in question is of cheaper construction, of sturdier construction and of a more reliable operation as compared with the conventional hooks.

The features of the hook according to the invention and its advantages over the prior art will become still more apparent from a scrutiny of the ensuing description of an embodiment thereof as given with reference to the accompanying drawings, wherein:

FIG. 1 is a side view of the hook.

FIG. 2 is a front view.

FIG. 3 is a cross-sectional view taken along the line lIl-llI of FIG. 1, and

FIG. 4 is an exploded perspective view.

With reference to the drawings, the hook according to the invention comprises a stalk 1, from which a hooked portion 2 is integrally formed. In the stalk 1 there is formed a depressed portion 3 which houses a spreader washer 4, an oscillatory blade 5, a stationary blade 6 and a supporting plate 7 (FIGS. 3 and 4). The assembly is united together by a screw 8 which is screwed in a hole 9 of the stalk 1.

The oscillatory blade is pivoted about a pin 10 of the hooked portion 2; it should be noted that the same pin 10 passes through the blade 6 to cooperate with the screw 8 so as to keep the latter stationary. The oscillatory blade 5 has in its rear portion, the usual rear extensions 11 as cam followers which are radiussed to the blade by a large radius 14 (FIGS. 1 and 4).

According to the invention the side supporting plate 7 has a width which is appreciably greater than the diameter of the stalk l and has a fork 12 which straddles two planar, parallel and diametrically opposite surfaces 13 of the stalk 1. In addition, as can clearly be seen in FIG. 1, the plate 7 has an outline which is substantially identical to that of the body and the rear extensions 11 of the blade 5, which in their end working positions are thus laterally supported in any case. This special configuration of the plate 7 and its mounting astraddle on the stalk ensure to the assembly a considerable sturdiness and operational reliability.

The hook according to the invention, moreover, is particularly advantageous due to the presence of the spreader washer 4, which can easily and rapidly be replaced both when worn out and for working reasons, if it is desired to vary the headroom between the inside surface of the hook proper and the inner surface of the stationary blade, the oscillatory blade 5 being lodged in said headroom.

What is claimed is:

1. A rotary hook for thread-knotting machines, characterized in that it comprises, in combination, a stalk, integrally with which a hook portion is formed, there being a depressed portion in said stalk to give seat in succession to a spreader washer, an oscillatory blade with cam-foliower rear extensions, a stationary blade and a supporting plate, fastening means being provided to put the whole assembly together.

2. A hook according to claim 1, characterized in that the plate has a fork which straddles two planar, parallel and diametrically opposite surfaces of the hook stalk.

3. A hook according to claim 1, characterized in that said plate has a width which is appreciably greater than the stalk diameter.

4. A hook according to claim 1, characterized in that said plate has an outline which substantially corresponds to that of the body and the cam-follower rear extensions of said oscillatory blade.

5. A hook according to claim 1, characterized in that the cam-follower rear extensions are radiussed to the oscillatory blade by a large radius.

UNITED STATES PATENT OFFICE CERTIFICATE OF CORRECTION Patent No. 5,889,990 Dated June 17, 1975 lnventor(s) Pietro M SSa It is certified that error appears in the above-identified patent and that said Letters Patent are hereby corrected as shown below:

On the Cover Sheet, the following should be added:

-[75 Assignee: Mesdan di Messa Pietro, Salo (Bresoia) Italy Signed and Sealed this fourteenth Day of October 1975 [SEAL] Attest:

RUTH C. MASON C. MARSHALL DANN Arresting Officer Commissioner of Parents and Trademarks 

1. A rotary hook for thread-knotting machines, characterized in that it comprises, in combination, a stalk, integrally with which a hook portion is formed, there being a depressed portion in said stalk to give seat in succession to a spreader washer, an oscillatory blade with cam-follower rear extensions, a stationary blade and a supporting plate, fastening means being provided to put the whole assembly together.
 2. A hook according to claim 1, characterized in that the plate has a fork which straddles two planar, parallel and diametrically opposite surfaces of the hook stalk.
 3. A hook according to claim 1, characterized in that said plate has a width which is appreciably greater than the stalk diameter.
 4. A hook according to claim 1, characterized in that said plate has an outline which substantially corresponds to that of the body and the cam-follower rear extensions of said oscillatory blade.
 5. A hook according to claim 1, characterized in that the cam-follower rear extensions are radiussed to the oscillatory blade by a large radius. 